Keeve and Sskeer are one of the High Republic's most interesting Jedi pairs. It's too bad they got relegated to comic books, which seems to keep their story going over the same basic plot points again and again. I'd like to have seen them in a regular book.
But the main lesson from this comic book is this: Star Wars has to set limits on how many species live for hundreds of years. When we first meet Yoda, one of his defining character traits is that he's nine hundred years old. We sense that one of the reasons he's so wise (at least, we're told he's wise) is that he's so old. Someone who lives hundreds of years ought to have a lot of accumulated wisdom.
But then in The Force Awakens, we meet another small, wrinkly creature who lives for hundreds of years. She's not particularly wise, or interesting, or important to the plot. So her longevity seems like a gimmick.
Then we learn in Solo that Chewbacca is really old. And then Ki Adi and Vernestra appear in The Acolyte; I had no idea either of their species existed for hundreds of years, but there they were. Now the High Republic gives us Azlin Rell, and Porter Engle, and General Viess, and Yarael Poof, and Oppo Rancisis . . . and, in this comic book, Tey Sirrek returns as a bearded, elderly character. Come on. Enough.
The problem with so many characters who endure for hundreds of years is that it changes the basic chronological "feel" of Star Wars. Yoda was an anomaly, and his longevity added something interesting to his character. But when it becomes almost the norm, it makes it hard for me to enter into the story's world, since "urgent" and "significant" would be so different for someone who lives a long, long time. Characters ought to remember things from hundreds of years ago, which means there are fewer surprises, and other characters (Jedi especially) ought to demonstrate much more wisdom than they ever do.
I really didn't care to see Tey return, more than a hundred years later. Nor did I want Lourna Dee to return. She has never been interesting. When the Nihil are introduced as anarchic chaos agents, then what's the point of a character who leaves the Nihil to become . . . an anarchic chaos agent? There's nothing to do with that.